Use-after-free in Linux kernel - CVE-2026-68156

Vulnerability identifier: #VU142159

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-68156

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to use-after-free in the Ceph authorizer handling code when processing a rebuilt authorizer during a messenger reconnect. A local user can trigger an authorizer update that reallocates the buffer and then cause a reconnect to use a stale pointer to cause a denial of service.

The issue is triggered when a newer service ticket causes the authorizer to be rebuilt and the rebuilt authorizer no longer fits in the existing buffer.

Linux kernel
openEuler
kernel
python3-perf-debuginfo
python3-perf
python2-perf-debuginfo
python2-perf
perf-debuginfo
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-source
kernel-devel
kernel-debugsource
kernel-debuginfo
bpftool-debuginfo
bpftool
kernel-headers

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
kernel - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232
python3-perf-debuginfo - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232
python3-perf - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232
python2-perf-debuginfo - update to 4.19.90-2608.6.0.0388
python2-perf - update to 4.19.90-2608.6.0.0388
perf-debuginfo - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232
perf - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232
kernel-tools-devel - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232
kernel-tools-debuginfo - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232
kernel-tools - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232
kernel-source - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232
kernel-devel - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232
kernel-debugsource - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232
kernel-debuginfo - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232
bpftool-debuginfo - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232
bpftool - addressed in versions 4.19.90-2608.6.0.0388, 5.10.0-331.0.0.232
kernel-headers - update to 5.10.0-331.0.0.232

• https://git.kernel.org/stable/c/0060ec912292a550198d8d18ac95b433c92a7091
• https://git.kernel.org/stable/c/5ecfcd5c05866f185357700b81b461dae4f5ebb2
• https://git.kernel.org/stable/c/75e82e8944ac1efe9fdb88bd2f14d9a031282bdf
• https://git.kernel.org/stable/c/937d61f86d377a3aa578adae7a3dfcecdddf9d89
• https://git.kernel.org/stable/c/9d37aec9ffe4e743dabc3f84502e9723e17a30d4

• Use-after-free in Linux kernel ceph
• openEuler 22.03 LTS SP4 update for kernel
• openEuler 20.03 LTS SP4 update for kernel